You can become pregnant if you have sex within three months of having a baby, so you still need to use contraception. The timing of the return of menstruation and the resumption of ovulation after the birth of a baby is affected by whether or not you are breastfeeding. Generally, women who are not breastfeeding will resume menstruation 6 to 10 weeks after giving birth and will be able to resume ovulation about 10 weeks after giving birth. Those who are breastfeeding will have a delayed return to menstruation or will not have menstruation during breastfeeding, and will usually resume ovulation 4 to 6 months after delivery, so it is possible to become pregnant if you have sex in the first 3 months after delivery. After delivery, it is necessary to pay attention to proper rest, keep the vulva clean and dry, increase diet and nutrition appropriately, encourage breastfeeding, and prohibit sexual intercourse and pelvic baths for 6 weeks. When sexual intercourse is resumed, contraceptive measures should be taken. Those who are breastfeeding are recommended to use instrumental contraception, and those who are not breastfeeding can choose drug contraception under the guidance of a doctor.